Manifest Contains Start URL

Overview

After your web app has been added to a user's homescreen, the start_url
property in the Web App Manifest determines what page of your app loads first
when the user launches your app from the homescreen.

If the start_url property is absent, then the browser defaults to whatever
page was active when the user decided to add the app to the homescreen.

Recommendations

Add a start_url property in your Web App Manifest.

{
...
"start_url": ".",
...
}

Check out Manifest Exists
for a list of guides that teach you how to properly
implement and test "Add to Homescreen" support in your app.

More information

Lighthouse fetches the manifest and verifies that it has a start_url property.
The manifest that Lighthouse fetches is separate from the one that Chrome is
using on the page, which can possibly cause inaccurate results.

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